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By Anil Ananthaswamy INCREASING the number of antennas on mobile phones will dramatically improve reception and reduce the number of blind spots in buildings, say US researchers. One of the most serious sources of interference is caused by signals bouncing off several buildings (see “Radio blast”). This will be even more of a problem with the next generation of phones—where more users will share the same frequency band. Multiple antennas coupled with sophisticated signal processing can eliminate most of this interference, says Michael Zoltowski, professor of electrical and computer engineering at Purdue University in Lafayette,